Changes

Following Roman custom, the Byzantines began their calendrical day (''nychthemeron'') at midnight with the first hour of day ''(hemera) '' coming at dawn. The third hour marked midmorning, the sixth hour noon, and the ninth hour midafternoon. Evening ''([[Vespers|hespera]]) '' began at the 11th hour, and with sunset came the first hour of night ''([[Compline|apodeipnon]])''. The interval between sunset and sunrise (''nyx'') was similarly divided into 12 hours as well as the traditional "watches" (''vigiliae'') of Roman times.<ref>Prof. Dr. [http://aha.missouri.edu/people/rautman.html Marcus Louis Rautman]. "Time." In: '''[http://books.google.ca/books?id=hs3iEyVRHKsC&printsec=frontcover&source=gbs_navlinks_s Daily Life in the Byzantine Empire]'''. Greenwood Publishing Group, 2006. p.3.</ref>

In this historic sense, The period of time known as the term may refer to the period that ''nychthemeron'' thus defined the [[Daily Cycle]] of divine services of prayer and worship that punctuates each liturgical day (''nychthemeron'') in the life of the Orthodox Church is performed.